docs: def is_already_locked(request, get_username=get_username_from_request, username=None):
      """Parse the username & IP from the request, and see if it's
      already locked."""
      user_blocked = is_user_already_locked(username or get_username(request))
      ip_blocked = is_source_ip_already_locked(get_ip(request))
  
      if config.LOCKOUT_BY_IP_USERNAME:
          # if both this IP and this username are present the request is blocked
          return ip_blocked and user_blocked
  
      return ip_blocked or user_blocked